Fairchild 74-13A Service manual

74.134

aALTEf,ATED

CALBNATED

lnrlruclion

DE

DETAYING

Monuol

G

rup

Ihir

Plug-in

Srriot

wllh

llodulc ir

Orcillorcopc.

tho Typc

Serlol

766H

No.

dodgncd

lnrcrt lhir lrtonuol into thr

Sorior lnrtnrdion Mqnuol.

for urc

with

lhc Foirchild Typc 766H

Undcr

you

rocrivcd

f_.-,--

@)

liii

{tir.lllu

rccr.ro

.rld hir.rr.nt

FAIFIEHILE'

INSTRUMENTATION

,0 torlt,ar

Ccrp,

ttaca.

clttTox,

x.

r.

07ota

fl.rl-t

N..

aroa t,lra

TABLE

OF

CONTENTS

scc'ion
t. IECHMCAT

'UNMATY

troduction

In

l-l

i..ftni."t

t-2

OPEiATNo

2.

Time

Fint

2-l

s*ap-rriesding

i.i

itic&t-s"ir'.ce

z-i

;-i i;r"&;

+iffii*mrk":l

i:

s*l6bp.*tional

i-i

z.i s*reeb

s;;;'p

i-6

I-io

i-ii
i-ii

I-ii

i-ii

is

i

2-16

2-l?

3. CIICUTT

3-l

3-2

&t

34

5-5

36

E4

3-8

.. PERFOI'IIANCE

4-l

4-2

4.'

+4

4-5

4.6

+7

4a

4-9

4.10

bisptavs

x-v

o,itp,it

6"t

s-"*tJtt

fi-i-lt."t"rimet'ts

;i"i'sillii

wia,n$;3suremena

P"t*

Width

Pulse

the DelaY

P;il

llii.-i

DESCTIPTION

Introduction

Triccer

Trigger

Ciri[it

rcuit

Clr.oii

Strobe

Circuit

r'iocared i{ode

Triggered

Circuii

Strobe Modc

Circuit

rcult

Anned

Horizontal

Description

Maintenance

Performance

Checlins

Ct..rin!

Cnecrini

Armed Swecp Displavr

Armeil

:lav calibration

D€laY Calibration

NDT Gare
NDT Saw

bual

Beam Positioning

Auto

Tillc

Summary

|NSTIUCIIONS

(Specifrcations)

OPeration

- ,---

$lectiot'

C;piing

selection

Modes

Eipander

c"Iiur"tion

Adiwtment

:

.....

'o"tPut

'

.

"""

'.

----

"

."""""

"""'

Measunments

ulT

Measurements

Vernier

u...,rrt-tnts

Description "-

Circuit

Clrcurt

Description

pet.tiirtion

LrescrrPu

DescriPtion
DescriPtion

Description

lrescnP

Trace

Triggering-and

D€scrlPuon

Mode

tion of

........

Mode

Deflection

A'IUIANCE

Check

SweeP

Trig5ier

Calibration

Nofral,

Out

Out

Switch

Displayr

Ch€ct

Chect

Sweep

of

of

of
of

source

Triggered
che

Cheak

Trigering

IndiCitor

Control

Using

-

Normal

Triggered'

DelaYcd-

Armed-

DclaYed'

Circuit

IESI

to Assure

and

........

...

.

SYnc

HF

Page

r.t

r4

""'

2-l

""'

" ""'

tl

?-l

?1

n^

?-!9

"""2-lI

2-l

" ""

""

2-12

.

"'' ?'l-Z

--"

""

-

'.-

--.-

s]'*P

Polarity

and

.........

............

Chect

Checl

Check

""

"" '

. .

"""

""'

"""

--

"

"""""

z'tz

?'l?

2-15

'

-

.4-2

"'

"

,-,,

z'lt

2'14

E-r

3-l

3-:'

E6

34

t-10

3-10

4-l

4-l

+l

4-2
4-2

4-2

+2

4-3

4-3

I

Sccaion

IITAINTENANCE

5.

lntroduction

5-l

r{L.o"rl

i-i

s.i"iii"s

s-5

i+ c.i"ind,t.."s

iiuip*.nt

iiii

6.i

56

l]

5-9

i-io 3i.'*

5-lt

s-ii

6-ii

6.

Figurc

Adiuitniena

Ni?E-DA

i'l'-*l'llaut;i;;;ru;;;,;.;;

NDT

si'iii'c.iXdiust

Swecp

DA

5*Lp

'n.gi."ation

iio

X AmPliEer

5-t4

5-I5 x'

5-16

5-17

" "

r-re

;-i,

Adiustment

iil;i-

Sweep

Fast

Strobe

"-C;;.;ii;;

o.;v-

D;i;i,c,i

PAiTS

6A

6B

USI3

Electrical

Soare Parts

ilist of

Sweep

l-l TyPe

Base
me 74-l3A Ft

TyF

2-la

z-lb

2-2 TvDe

2-5a

i-3b

Connectors

TyPc ?4'l3A

Connectorc

Tft

liire

DisPlaY

2-42 Tvrr-'7+lr{

i-lu f'vix Z+-ts,t

2-5 Elibs€d

Finhing

2{

Phase

2-7

lc

Ti

IECAIITIAIION

AND

RePlacemenl

and

Hints

irig

Swcep

Length

Bai Adluitment

n'ia

.......

.

.1.

to Chasis

Required

....

""

Sens

Length

Adiustment """

Adjustment """

- -

"""""""""""

Adiustment '

1'Front

-1

High'Frequencv

Balance

DC

Calibration

IniensitY

Adjustment '

Adjustment

Pattern

and

A'djustment

Adlrisrment

Z.io

aaj"i.*.",

SCHEIVIATICS

AND

List

Parts

List

Recommended

Check

IlLUSTRAIIONS

74-l3A

PluEln

?4-13fi.

74-l3A

74-l3A

7$l3A

....

Time

the

Shift

-

................

.....

Vendors

CHARI

Calibration

Titlc

Delaying

Function

Function

Normal

Triggered

DeliYed

. ........

Armed

Armed

FrequencY

Measurements

'r-' "

"""r

Strobe

Delayed

Measurement

of Controls

Display

Triggered

oI

.. .......-.

..

for

" '

""

Chart

Sweep

Controls

of

Strobe

'." " '-':'-

'."""""

Parts

""

"""" ""

"

"

"" """"

Service

........

Panel)

""",''

""""""'

" '

""

""" ""

.""""" 4-2

Time

""" '

'

Display

Display

Display

.

"

""

"'

"" "'

"""

' ""

"""

and
and

Pagc

'

' '

"

"

"

""

" "

5-l
5-l

5-t

5-2

5-2

5-2

i'!

t'r

5-5

5-5

5-5

5'4

5'!

54
'-5

q-9

5'5
5'5

6-l

6.1

&9

Pagc

"

""

'

r-2

2-2

2-3

2-5

2S

2:7
2-8

2-9

2.12

2-1,

2-r5

Figurc

2-8 Pulse
2-9 Pulse Width

lt[USf iAIIONS

Tialc

Width

Measuremenb
Measurenrents

Circuit, Functional

(Contlnucdl

Using

Block

Pagc

2-r3

2-14

2-t4

3-2
3-2
3-4

Figurc

5-7

3.E

3-9

10

3-

I

3-l

12 Horizontal

3-

5-r

5-2

5-3

6-l

Titlc

Sinrplifred

Delayed-Triggered

Arured'Strobe"

Diagraur ...... .. ........ ..

Simpli6ed Tinring Diagraru

Delayed-Armed

Delayed-Arrrred Mode, Functional

Diagranr

rrplified

Simplified

Delayed-Arnred

_

-Func,tional

Right

and,A.djustrrrens

Left Side View

Nuvistors

Top View

Adjustments

Front

Tinring Diagranr

Display

tod., frir.tion"t

Strobe Display ............

Tiuring

Deflection Anrplifier,

Side View

Showing

Panel Replaceable

Diagraur

Display ............

-Block

Diagram

Showing

Showing Transistors,

and Adjrrstrrrenrs ..

Transistors

for

tbr

for

---.

'I'ransisrors

Parts ..... .............

and

ttio.L

Block

-- -

........

-

.. 6-0

Pagc

3-9

3-r0

3-l l

3-r2

3- 13

3-12

54

5-7

5-E

section

technicol

I

-

summory

.,,.-

*"-***\f.-

DEI.AYID

i,t{

colrPt

j

il

e

l-2

f,t

cufrot

Figutc l-1. fype 74-l3A Calibtoled Deloyiag Sweep Plug-la

SECTION

I

I.I. INTRODUCTION

IMPORTANT

MADE

MUST

THIS

entitled

instructions.

The

laying

Type

To

breviations

base delaying

BE

PLUG-IN

"First Time

Type ?4-ltA

Sweep

765/765IJ

simpli{y

is designed

Series of Transistorized

circuit

are employed

sweeps.

TECHNICAT

PTEASE

INITIAL

MODULE'

Dual

NOTE

ADJUSTMENTS

BEtr'ORE

See Paragraph

Operation"

Time

for use

description,

to describe

OPERATING

in Section 2

Calibrated

Base

the Fairchild

with

Oscilloscopes'

following

the

the

dual

2-l

for

tine

De-

ab-

SUiAXTARY

Abbrevictlon

NDT

DA

I.2. IECHNICAI

perfortrtatrce specificatiorr

The

rurodule

[ollows.

is

The NDT

Sweep

gered operation

sweep
delay

'l'he

Arrrred

sweep

oft trigger

An

quire<l

given in the

operation

starts

pick-ofi

DA sweep

operation

(NDT)

input trigger

to

5UIAf,IARY

Dercription

sweep

rettrs to

Delaying

and

(i.e.,

immediately

trigger

generates

which anns the

fire

the

is generated).

refers

(i.e.,

signal

DA sweep.

of

technical

strrnnlary

Normal

Trig'

delaYed

the

after the

to Delayed

the delaying

a delay

this

pick'

DA sweep).

is then

re-

plug-in

which

t-3

section I

-technicol

summory

Cqlibruted Sweep

Colibroted lineqr

2 sec/div in 23 steps

Uncolibrqted

The

uncqlibrotcd ronge

ond

:econds full scqlel.
indicotor

Swecp

Sweep Ronge

Sweep

exf€nds

of uncolibrqted

Accuroty

t3% meorured over

lhc

CRT screen

Sweep

Swcep

Sweep

Goie Out

5ow

Other Conlrols

Ronge lndiaoto.

Push-pull

pendenl

Exponder

A

cqlibrqted Xl0 swecp

clutch knob

control of the NDT ond

omplifier will

center; extends ,ortesl
seconds/div,

rpeed3 fosier

for slower

tweeps. Neglect

Colibrotion

A front-ponel

vided

lhe

externol timc atondord

Two fronl-ponel

tive-going pulse
pedonce

lood impcdqnce

ond

direcily

swecp

Ponel

pcrmit

to

Moin Frome

(NDT

is 500

shunted by less thon

lo

bonono

of opproximolely

ihe NDT

l0K

thon

lnlernol

strobe inteniity

izes the

ovoid:

obrerving strobed

Sweep. Output impedonce

ohmr, ond lood impedonce

l00K ohms

controls

plug-in

hoving to reset

TIiAE BAsE

f,onge

iweep rqtes

Vernier

sYsTEM

(NDT

of l, 2,

conlrol

DA)

&

from 0.1
ond 5 requencc

providcs

of sweep rolcs between ronget

thc

2 sec/div ronge to 5 sec/div

The UNCAI lomp leryc!

expond

Exponder

ihon 200 nonoseconds/div

screwdrivcr

normolizotion

qnd

stondordizinq thc

yernier

or

the centered

permits

simultoncous

DA sweap rotes

cxponder in the X

lhc rweep

sweep role

occurocy is

the firlt

SWP CAt control i6

of thc

A DA)

bonono

of 2.5

ohms. For oplimum

should be

ground

ond i5 time-coincident

provides

iock

25 volts

shunied

optimize setiings

ond

strobe ironsiiion.

to the

CRT of the

iocks

yolts

greotcr

l5

ond is

by

eoch

nominql.

pf.

Gote

posifive

o

should

less

thon l5

ihe iniensity

disploy

modes

;lsec/div

o coniinuous

operotion

poriion

div

8

or inde-

obout screcn

lo l0 nono-

t5"L

ond

nqnosecondt

50

plug.in

rweeps to on

provide

o

Outpui im-

performonce,

thon lOOK

is rcfcrcnced

with the

.ow

coincident

is nominolly

greqte,

be

pl

of outomoli€

This normol-

Moin Frome

conirol

(50

oi

outpui

lor

+3

pro-

unit to

posi-

ohms

outpul

with

qnd

when

%

qn

of

SWEEP MODES

Normol

to

Deloyed-friggered

Deloyed-Armed

Deloyed

Single

X

Deloy Vernier

Sweep Operotion

Conveniionql

rweep disploy. lnlernolly

opplied trigger signols

circuil

Strobe

Deloying

rweep

disploy showing lhe deloyed

or o brightened reclor. The

immediotely
eroied

Deloying

os

o brightened rector, but

ened sector) i: ormed
initioted

The deloyed

rhe

deloying

brightening

position

Triggered

The

brightened

ofier the deloy

5trobe

sweep disploy showing ihe

by o sync

lrigger

sweep outomqticolly

sweep

of the sweep retrqce

or Deloyed Armed

scctor of the sirobe

ore exponded to full

LAYED modei.

off

the

of

sweep

dury

cycle

Sweep

The sinEle

sweep of the time
until ihe deloyed

The single
externql irigger

Level control
swiich

The

SWP

loyed

sweep

to

be irigge.ed

Amplilier

When the

X lnput

EXT setiing

lerobly

"

CAIIBRATED DEIAY IIME

A len-turn

on-icreen distonce

itort o, which

Automotic

deloying

(DA)

performonce

sweep

is lerminqied. Thir permits

iweep mode

bose lo oppeor

sweep

rweep moy

pelse,

or by switching the NDT trigger

READY

(for

D|SPIAY LOGIC

signols

indicotor is lit whenever

goie

multivibrqior

X-Y Disploys)

moy be opplied

of thc Trigger

Slope"

-

Control

precilion

lrom the

the

deloyed sweep is

the

drive

deloyed sweep

pick-off

dclqyed

the

by

deloyed

is terminqted.

scole in

proyision

in the DEIAYED

{DAl

be

by

either of the DE-

(NDT)

when

permits

is rescl

reormed

iurning

i: ormed

swirch ir

to X Amplifier

SOURCE switch

SYSIEM

poteniiometer

deloying sweep

or

exiernolly

NDT

lime bose

swcep

stqrtr

trigger

deloyed

sweep

gen-

is

sweep

(bright-

trigger ond

shuts ofl when

in

is mqdc

but one

prevent3

Thie

either STROBE

sweep disploys

for shut-

the deloyed

moximum

mode

driven

the

oi

icreen

or.eormed

q

with

single

the NDT Trigger

polority

the de-

ond reody

5et to X AA,IP,

vio

pre-

ond

determinei

either triggered

the

(NDTI

or ormed

l-4

technicol

summory

section I

-

CAIIBIAIED OETAY lll

The DEIAY VERNIER
from zero to

o Deloy

Deloyed

Accurocy

lncrementol

trol is

Deloy Zero

Zero deloy i:

extreme

to

on

Deloy

Ronge

within

exlernol slondord

l0

Multiplier

TIME/DlV

occurocy

i0.25

Conlrol

occurocy, cny

from o minimum
20 seconds

IRIGGERING

(Scporole

fqciliiior for

HF Recur

A

unique high-frequency stobility switch

used to improve
hoying repetition

iloble synchronizqtion
to

beyond 50 Mc

lnternol Trigger

Signols

I Mc;

Type:

in Y covity. With
qdiurtment

trols will

will

trigger from 0.5 div of Y signol

from I div of Y signol up to |

76-01A, 76-02A,76-03

of the Trigger IEVEL

produce

o{ Y signol ol I Mc

30 Mc

(Concludedl

is

colibroied

control

in

coniunction

cqlibrqled con-

con be odiuslcd

losc orc

io reod

functioni

with ihe

ponel.

pqnel

proyid.dl

control

divisions.

when

coorrol

of the len-turn

%

odiustoble

or oll steps

ya

of

cqch fimc

SYSIEM

E

This

used

from the front

from the front

microsecond to more

SYSTEM

moy bc

counl down

rqte of 5 Mc

the HF STAB control set to RECUR,

o stoble

qnd

qnd

lock-in

grcqlcr.

of signols

or

of I cm dcflection

0

qnd

76-08 Modules

qnd

HF

STAB con-

disploy

2 divisions o{ Y signol

with

0.2 diviiion

of signolt

provides

lt

Mc wiih

lhon

up

For

ot

qs

io

Trigger

Slope

positive

Selection

Line,

of

or Externol triggering

or

[ine Trigger

Line frequency

poloriiy

with

the Trig LEVEL

Ext

frig lnput lmpedonce

I megohm

AC

Coupling

High-poss

cycles

DC

Coupling

Direcf

coupling is

tivity when

mointoin lhe iniliol reference

wiih respect

setting; ond lo ovoid trigger

rondom repelilion role lrigger signqls

ACF

Differentiqled

vided to

modulotion; low-frequency

Signols should rise

pois

the LF reject filter

Automolic

Triggering

Visible bose line

no

iignql

signol

of

q

trigger signol switches the sweep to the

mode immediotely

triggering con be selected in

ond the iriggering

conlrol

shunted by

filter

very slow

to the CRT scole oi o

trigger input;

reiect hum

inpui,

l0

cps

40

with

low-frequency

provided

woveforms

ond low-frequency

or foll in lesr

oll sweep ronges when there is

on

The rweep free runs uniil o lrigger

to l0

Mc

negotive

slopes on lnternol,

is

ovoilqble

poinl

mqy

(nominol)

pf

be :hifted

cutoff ol 80

to optimize trigger 3ensi-

ore opplied; to

porition

point

high-poss

of lhe lroce

given

trigger level

voriolions

{ilter is

omplitudc

cutoff nominolly l0

thon 100

is

opplied. Applicorion of

triggcrcd .

either

du€

pro-

prsec

lo

Kc.

to

Extcrnol frigger

0.5 volt

the sweep; I volt

to l0

(Xl)

peok-to-peok

Trigger

Mc.

or dc coupling ore included.

,rol sei io RECUR,

produce

control

lOV input

Externol Trigger

Some frequency limits

'10,1

ing

Trigger

A ronge

ground

will

ot I Mc

(XlOl

qttenuqtor

copobility to

Level

of i'l 0 volis

on exiernol lriggering

lrom dc to I Mc will trigger

peok-to-peok

leveling, slope ieleciion

odiusiment

o stoble

provided

is

will trigger the

Wirh the HF STAB con-

the Trigger

of

disploy

os

exiernql

to

extend

:t100 volts dc

(nominol)

with

with

trigger

the

dc level.

respeci io

sweep

qnd qc

LEVEI

0.2V to

Xl; o

HORIZONTAI.

DEFTECTION

Bondwidth

Direct

Coupled: DC to

Copqcitively Coupled: Low-frequency

cycles

Sensitivity

(XI0

Exponsionl

2 Mc; down 3 db ot 2 Mc

EXT/XI Ronge: 0.1 voli/div

EXT/XI0 Rongc: I volt/div

X

Vernier, A tert-io-one

vided in the horizontol

tion chonnel io exiend the inpul

signol ronge to l0 volts/div

Seniitivity

(Xl

Exponsion)

Reduces oll obove

sensitivities by l0:l

scon)

sYsTEM

cutoff is

ottenuotor is

(Restricied

80

pro-

deflec-

I

-5

rection

I

-technicol

rummoty

\--.

HOIIZO TAf DEfLECIION

lnPut lmP'don"

lnFul

I mcAohm

Connaclot

rhuntod

x A lp froni-ponal

usc ol

dirployr.

lhc

horizonlql

(DA

EXT TRIG connccto.

purporel

SYStEil

pf

by 40

conna€ror

dcfloclion

(Concludodl

(nominqll

providcd

i!

omplifior for

tGrvc, thit duql to

parmil

ro

X'Y

X Poritlonins \

A fronr-ponal

tioning
rwcap to withio

Boom

Porillon lndltoloru

Two indicqlor lonpr

qlad

whan

ii ir

control

of th.

X lnput rignol

th.

op.roior or lo

poritioncd

p.rmitr

iwo

divirion!

orc

off lhc rcrccn

coqrrc

or

of

locotrd

the

dircciion

ond finc

ponion

ony

rcrqGn

caniar

on th. tront

tho

of

poai-

oI

pqnrl

Lcom

th.

I

I

t-6

sEcTroN

2

OPERATING

2.I. FIRST IIME OPERATION

(Figurrt

If this is the ftrst tinte these

then certain

Used,

For instructions,
Recalibration

nrake

The

tbllowing adiustnrents.

the

NDT

Sweep

DA

Swecp

Strobe

Pqitcrn

Deloy Zero Adiurimcnt

Dcloy Col Adiurtncnt

following illusrations are

operator in beconring

Sweep Plug-ins.

Figures

Figure 2-2
Figure

Figure
Figure

Figure

Unless otherwise

Y Amplifler Plug-in module is inserted in the

&

2-l

2-lb

2-3a

2-3b

2-4a
2-4b

(left-hand side) and the Type

Plug-in unit

side) of the Main Frame.

know that

We

with your new

deavor,

you may set up the insrument

in calibrator

various conrols on

2.2.

SWEEP

Two trigger

Sweep plug-ins. Each Time

own separate triggering

To obtain a stable

sistently

cycles of the input waveform. If

to occur

of occurrence of the input waveform, the

pattern will be traced

start at the same time relative to recurring

at random

to 2-41

2-l

have

rrrust be lnade.

Maintenance and

Porogrcph

5-9

5-r0

5-l I

5-17

5-t I

5-19

designed to aid

reler

and

Adiuctmcnt

lcngth

Swecp

Col

lcngth

lniensity

Correclion

plug-ins

initial adjusttncnts

Section 5,

to

the paragraph indicated,

to

qnd

tamiliar with the

a

Type 74-13.4,

and Connectors

Type

74-13A,

Type 74.134, Triggered

Display

Type

74-13,{,

Display

Type

74-13A,

Type

74-13A,

designated, it is presumed that

Function of Controls

Normal Display

Strobe

Delayed

Armed Strobe Display

Armed Delayed Display

Triggered

74-l3A

Time Base

is inserted in the X cavity (right-hand

you

are anxious

instrumenl To aid

demonstrate the effects

to

signal

the display.

IRIGGEIING

get acquainted

to

you in this

using the

circuits are built into the

Base is provided with

facility.

display, the sweep

the

at a rate unrelated to

or

at a difterent point on the

out

must con-

sweep

been

ever

and

the

Delaying

Y cavity

en-

built'

of the

Delaying

its

is allowed

the rate

displayed

INSTRUCTIONS

screen each time the sweep

the waveform to

drift

ligible. The sweep theretbre

input

signal, or by sonre

tinre relationship to

poses, the starting of each

the screen

rnay be callerl

lollowing instructions tell

the proper

triggering signal

2.3. TRIGGEI SOURCE

lnlernol

o.

For rrrost applications,

by the

the signal amplitude

To

signal,

ternal triggering

Y input signal.

obtain

riggering

set the TriSger

is convenient

gering connections

are obtained

in rnost applications.

b. Extemql

Sornetirrres

it is advantageous

with an external signal.

pecialty useful where signals

lrom several difierent

With external

reurains constant in amplitude

a

possible to observe the shaping

signal

oscilloscope triggering
AIso, time

forms at difierent

in an external

For example,

rived from

tirrre relationship and phase of the

in the circuit are cornpared

1>oint

by the displayed waveform.

When a

it is possible to observe and

able,

jitter

of

trigger input signal. This is not

is

sweep

signal

scope

trace
show the proper time relationship

displayed signals. To

ternal triggering

nray

to display the

External triggering should also be used

amplifier

riggering, the

and phase relationships

points in the circuit

if

the external

ihe waveform at

stable,

external

the displayed waveform with respect

triggered internally.

b€ used to externally

module in

signal

runs. This

the screen or to

across

must be triggered

signal which

the input signal.

horizontal

"triggering

yorr how to select and use

for various applications.

SELECTION

the sweep

The only

be sufficient

of the

SOURCE switch

are required.

Exrcrnal

are

places

triggering

circuit without

controls

the input to a circuit,

triggering signal

entire signal.

the

obtain a

must have an amplitude

will

bears a

For

waveform across
the sweep." The

may be triggered

requirement

to triSSer

sweep from

either

be

unintel-

by the

present

is that

the sweeP'

the input

cause

to INT.

since no external

Satisfactory

to rigger

triggering

going to

within an

signal usually

shape. Thus,

and

and amplification

results

the sweeP

is es-

be sampled

instrument.

resetdng the

for each observation.

between

riggering signal

waveforms at each

to the

the wave-

can be seen.

is de-

inPut

signal

is avail-

accurarcly measure

to the

possible when

A

trigger

preceding the

trigger the oscillo-

with

a dual-

AlTernate mode to

between

stable display, the ex-

the two

fixed

Pur-

In-

trig-

it is

of a

the

the

of

at

2-l

section

2

operoting instructions

-

DA

\

FACITIII€S

Tdg!f,. Lr.l S.l.d.r,

lrcb io .rt nd dc

FrI

l.tdini t

.rr fig;
Y.rrb

OlSttAY IOCIC tril.n

T.i99.r L.v.l S.lGror:

pel

le.ling io

+100V

..w..

co.rrol

t.ob to .

a

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DEI.AYIl{G

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Yo

LDtuYEo

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oll

I

r6flu

t(I

tl-l

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ltoflItt

dG

At{D DtuYilrG

rUIO

,S'

SWEEP

,Ih

nnuEo

J

''/'

l 5 2:

TimffitfiG

stP cll

C

uit

IlI'

ul

s0utct

I

.l

cllt

s0ufltt

t

I

Ill

TRIG

me

E*.rnol lrigs.r

Ahpli6.r

Irifff,

rit h.'

D.@-Ard.d

+

GAIE

.id.it

Sw..9, 2.5V 500l)

SAW o{lput

with rh.

25V, l0(

+

GA'IE ouiFl,t .oin-

wiih

.id.nl

Sw..p, 2.5V. 500()

Trigg.r

.wiiGh6
No.nql o.d D.loring

o. X

Input.on...-

.lidt

S.l.cl,o.

for lh.

13)

5*..p

otpol <oi.-

*ilh rh. DA

coin.id.nt

NDT 3w..p;

I

rh. NDT

did.

S.l..tor

lor

13,

lhc

2-2

il;tffhi'li*-

Figvrc

2-lo. fype 74-l3A Funclion ol

'

clnoi. i., u.st

Xt STAI .onhol im-

vs .&nld6vn dnd

s:I";,if:*#

rion .ot

NDT FACILITIES

I

Controk ond

::'.'i::,:J"ff:iJ?'

Connecrort

_l

operoting

BEm mrilion

instructions-section

2

DELAY ZERO GontrcI

prci..

p.rmit!

VERNIEI r..o odiurl-

DISPiAY LOGIC aw ch

d.t.rhin.. 3w..p oF-

.,olionol modG, !..

Con..n[i.
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!.ran;

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DELAY VERNIEI

l.ol

d.t

rc.... dirlonc.

no'nol

th.

which

ot

,wcp ir .ilh.. l ig-

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lioh. dr on a..ordl.

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DEIAY

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normol o, .t-

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pull

tnob

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Eultipli.r vh.n

eilh

con-

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?#'ffiI" \-?J.h"..?-/

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LI

I

CAL <onlrol

SIVEEP

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Int!

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TIORIIAL AITD DEI.AYII{G

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& OA Trl4E/DrV

S.l..ror !rit.h.s: lnobt

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or th€

DA tw..p lnob

con b. di!.ngog.d

rot.l.d

!.porot iy;

c.nric knob

Y.mi.r 3wccp

lomp

IUNCAL

ond

con-

provid.r

opcrolion

lightt)

Figvte

SWEEP

indi.ot.. DA Swnp ir

orF.d ond

2-lb. fype

lo'np

READY

r.odI to

74-l3A Fvnctioa

ftrfru f,r

o, Controls ond

Cornecrort

2-3

section 2-operoting instructions

least 0.5 volt,

time relationship

external

signal to the
ger SOURCE

Line

c.

lf the

ship to the

triggered

Trigger

coupling mode with LINE Trigger Source.

IRIGGER

2-4.

peak-to-yeak (l mc)

to the disptayed

signal

pattern

SOURCE

lbr triggering the sweep, connect

TRIG

EXT

switch to EXT.

on

power-line frequency, the sweep may

by this

signal.

COUPTING SEIECIION

connector

display bears a frxed time relation-

To accoruplish this, set the

switch

to LINE. Always use dc

bear

and

signal.

and set the Trig-

6xed

a

To use an

the

o. AC Coupling

Selection of

by setting the COUPLING switch to AC. This rlode

is provided with a high-pass filter that has a low-fre-
quency cutoff noruinally at 80 cycles, This feature

prevents

tern vertically and using internal triggering. In the

AC ruode, triggering

ponents o[ the

tioning of

selected to provirle the desired tlisplay via

the AC triggering rnode is accomplished

erratic

triggering when positioning the pat-

is

unaftected by the rlc com-

triggering

the

race.

signal or

The

by

vertical posi-

the

triggering level can

use of

the

Tlig LEVEL control.

When using the

switch

point

is

set

the Wovef ol n for a given Trig LEVEL

on

control setting regardless

Note:

AC coupling

calibrator signal or lquare

cycles,

severely integrates

rnended

fornrs

lbre discrinrinated against by the low-frequency

rnay be

lbr these

DC Coupling

b.

The DC

ruode is especially useful

which change very slowly and which are

ot the AC position (80 cps). llecause of

network tinre
randonr repetition

stably

in the DC rnode, This urocle pennits excellent

triggerirrg on all tyJrs of waveforrns and

AC rrrode, the Trigger COUPLING

to AC. The trace always

the vertical positioning.

o[

triggering on the line-frequency

wave signals less than

erratic

since the 80-cycle cutoft

the trigger. DC coupling

signals.

starts at

the sarne

is reconr-

for viewing wave-

there-

cutoft

the coupling

constant in the AC rnode, signals having

rates

are solnetirnes

viewed

is rnost useful

ruore

l(X)

6lter

in the lbllowing applications:

l. For optinrizing trigger sensitivity or operation

low-[re<lrrency

when

For maintaining the initial reference position of

2.

the uace with

signals

respect

are applie<t:

to the CRT scale at a

given

TRIG LEVEL control setting when on Internal

source: anrl

3. For avoirling rigger point variatiorrs

dorrr repetition rate

triggering signals.

rlue to ran-

be

be

When

switch is

trace

always starts at

a given

setting of the Trig LEVEL control

using the

set to

DC mode, the Trigger

DC. When using internal

the sarne

point

on

COUPLING

source, the

Scale

the

for

regardless

of the vertical positioning.

c. ACF Coupling

The ACF

rnode

is a

special

high-frequency lbrrn

the AC urode and is used to reject low-freqr.rency

components in the triggering signal. Use AC trigger-

ing

unless low-trequency rejection is required. Trigger-

ing

signals with

lbr exarrrple

sweep circrrits

ACF mode

hace

mod,e,

ACF ruo<le

of the

gering.

Signals nrust have

l0 g,sec

tirne

signals are to

ing.

Note that the Type

plug-ins

pernrits

the

ACF electronic

Occasionally

the calibrator

when the ACF ruode is

uill asmre

plug-in

ond,

two channels

when it is

using internol tt igger

prevents

when using the ACt'

provided

are

triggering from one channel

it is required

fre<luency

the difterence in positioning

froru interfering

be

switch

corrrponents

signal,

ttiggeting

stable

set up

rise or

<tisplayed, use external trigger-

76-08

fo|

fall

mode.

and

with a selector

below l0

rnay

not initiate the

Also,

use<l.

the

lxnn

alte|nate

source.

with

Thus the

stable trig-

times faster than

If slower dual

multi-trace

other

switch which

Kc,

the

d.ual-

sueep

level

only. Therefore

mode no

to

longer applies.

obtain stable trigger-

ing fronr a corrrplex high-frequency wave[ornr that

contains

querrcy cornponents. In such

and line pickup rnay rnake it difficult to

stable

rlo(le, thereby

<lesirecl corrrponents. The low-frequency corrponents

are blocked fronr the riggering circuit while the high-

frequency triggering

the

respects, the ACF

,A.C rnode.

unclesirable low-trequency noise or line-fre-

cases,

the additional

display. Il this occurs, select

elinrinating

waveforu

stable triggering that

is

[iggering

the ACF

the efiects

is

of

passed to produce

required. In all other

rnode is identical

noise

obtain

triggering
these un.

to the

2-5. IRIGGEI SLOPE SEIECIION

When

sweep is riggered on the rising

the Trigger

SLOPE

switch

is

positive slope of

or

set

to

+,

the

the excitation signal. When the Trigger SLOPE

switch is set to

negative

or

2.6. IRIGGER

The Trig LEVEL control

specific voltage which

ceed betore

switch is set to rhe

Trig LEVEL conrol

sweep consistently

the sweep is triggered

-,

slope o[ the excitation

IEVET

SEIECTION

perurits selection

the triggering signal must

the sweep fires.

When the Trigger SLOPE

position,

+

urakes it possible to trigger

on the positive slope

the falling

on

signal.

o[ a

ex-

adjustment of the

the

of the ex-

of

a

2-4

Mltflal

Io obl,oin

.r&p. t.l

p.rforn

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DrSPtaY

swEEP

th. .qlib.otor dirploy u!i.g NOR^IAL

th.

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ih.

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instructions-section

o. rhorr ond

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2

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Normol

Dirploy

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S.t rully

{NORM}

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2-5

section

2

operoting

-

instructions

S.r DETAY VtRNlEl

diol ,o 0 ond

th. OELAY ZEIO .on-
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Figure 2-3o. fype 74-l3A friggered

inr ro 5 nstlc

m6inm

-

fir

Strobe Disploy

2-6

operoting

instructions

section

-

2

DISPTAY O' CAL

SIGNAL

Lo..

{ol

(b)

i.i..rifi.d

Erpand.d

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by 6.

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Doti.n

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fu[

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r

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--

5

-

71-l3A Deloyed

tfiggered

Disploy

2-7

section

2

-operoting

instructions

thi. ir

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2-3b.

ond

of

rlt. <onlrcl..6dlY

S.l

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Armed

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Disploy

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SECI.

mSEC

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2-8

DIgPI.AY Oi CAI SIGNAL

LOGIC

OISPLAY

S.r

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DELAY.

operoting

@u

instructions

section 2

-

(a)

Figvre

2-4b.

t:;

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d.loy-orn.d

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opdqtor, but inn.6d i. inifior.d by th. n.rt ruilqbl.

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iha

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lype 74-l3A Armed

mod., th.

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Dizploy

I

;

noi

i!

2-9

section

2

operoting

-

instructions

citation

switch set

LEVEL control

consistently
signal.

ntay be

pulling

tion.

2.7.

signal.

Normal

extendecl

the

SWEEP OPEIATIONAT MODES

Conversely,

to the

position,

-

makes

it

on the negative

trigger level

to

I00 volts

:t

Trigger LEVEL

with the

adjustruent

possible

to rigger the sweep

slope ol

range

on external

knob into EXT/10

Trigger SLOPE

the

is

tl0

o. lntroduction

When

the start

period

application of the triggering waveform.
plished through

Base and the

NDT Time Base is

delay while

horizontal

duratiou o[ the

TIME/DIV

tings.

The delayed sweep ltature of this instrument

be

increase

magnification of a selected portion

sweep, accurate tirne rueasurerrrents,
neasureDlens

to pick

scan or

b. Sweep Rongc lndirotor:

The NDT TIME/DIV

indicator window nrounted

TIME/DIV

is identified

knob of

Delayed

permits

to adjust both

Delayed

rotated indepe[dently

NDT sweep rate.

c. No.mql Swo.p

lvhen

NIAL,

ing is derived

line. External

EXT TRIG connector.

d. Triggered

\Vhen

gered

using the Delaying Sweep

thg horizontal

of

of from

I

simultaneous use

sweep can be delayed {or

rnicrosecoud

DA Tirne Base. In this application,

used to provide the accurate

the DA

sweep at the

and the

employed

in a nuruber

its versatility.

of wavefornr

off and display any desired line

to check pulse-time

switch

as the Delayed Sweep knob. Turning the

latter

the

Sweep tiure duration.

the outer'knob to

Su'eep range knob nray

Tiure Base provides a normal

end of the delay

sweep delay is

DELAY VERNIER control set-

o[ special applications to

Such applicatiorrs include

jitrer.

rnodulation.

switch

on

is urounted

will also

engage

sweep ranges

to sweep rates faster than the

Dirploy

the DISPLAY

only the NDT

fronr the displayed

signals uray

Strobe Dirpldy

the

DISPLAY

STROBE, and

LOGIC

Tirne Base is displayed.

be applied

Reter

LOGIC

the Delayed TINIETDIV

Base Plug-in,

Tirne

to

seconds after

20

This

of the

controlled by the NDT

an

of

and accurate

Also, it is possible

of

is provided with

a plastic skirt; the DA

top

on

perurit

A

sirrrultaneously, or the

switch is set to NOR-

this

of

control

push-pull

the

skirted knob

be declutched and

signal internalty

to the lower

to Figure

switch

2-2.

is

set to Trig-

the Trig

of

excitation

volts. This

source by

posi-

is

accom-

NDT

Time

time

period.

a television

The

rnay

high

undelayed

skirt and

of

clutch

Trigger-

switch

the

an

the

or

is set

for a higher

DIV

switch, a portion

(See

Figures

brightene<t
Delayed

the

Delayed

uray

be positioued

VERNIER

adjusted with

that

the

ol the latter

sible to inch,rde

in the

brightened

The arnount

a

tion

of the triggering

Sweep

is pemritted

setting

DELAY

occrrt iurrrre<liatcly

1;rliod.

tlre

This rrrocle

Delaye<l-Triggerecl

of operatiotr

tinuously

tirne

arrd waveform

The Delayett

the Normal

brighteuing

STROBE positions.

e. Deloyed

When

gered

DELAYED,

play

in the STROBE

scale. See Figures

The amourrt

NDT sweep rate

magnification

,

IIaEnifrcation rittio

For exarnple, if

to I mSEC, and

to I

pSEC,

uragnified horizontally

LOGIC

tion.

Normal

This
DELAYED

switch

Autonratic provision is rnade

Sweep when

pernrits

f. Deloyed-Armed

If

the display is set for

the delayed

indicated

applied to the DA

sweep rate than the

o[ the sweep tnay be

2-3a and

portion

Sweep

Sweep

control.

start o[ the

control.

(Strobe) irrclicates

ancl the

length of the

cluration. The

left

or

The length

thc

Delaye(l TINIE/DIV

stobe is not afiected by

Using these two

any portion

or strobed area.

of delay occurring

wavefomr

to run, is determine<l

of the

VERNIER control.

NDI' TINIE/DIV

at the en<[

frortr uow

su'eep rrrotle.

that

pernlits the

variable

delay

jitter

Sweep

Su'ec1t

of

the

Triggered

the DISPLAY

autouratically

is

ternrinated.

sweep retrace in

Dirploy

LOGIC

the brighterred

position is

2-3b ancl 2-4b.

of nragnification is

to rhe

ratio ulay be

Norrnal Sweep Rate

-

)elayed Sweep Rate (TirrreTDiv)

the NDT TINIE/DIV

the Delayed TINIE/DIV switch is set

the brightened portion

1000 tirnes when the DISPLAY

is

set to the Triggered DELAYED posi-

the Delayed Sweep is terurinated.

rnaximurn

N'TODE.

duty-cycle perforrrrance in the

-

Operoiion

sweep does not

delaved period

trigger circuit.

until

NDT TINIE/

brightened.

2-4a.) The start

the start of the

strobe

start

of the stroh

right

with

the DELAY

ol the strobe nray

corrtrol. Note

controls,

of the display

fronr

the applica-

unril the

switch ancl

The

Detayed

of the

on will lrc

operator

tirrres for uraking

tneasurements.

Sweep

preset delay

referre<l

It

is thc ruo<le

to select con-

shtrts

This prevents

either

switch is set to Trig-

section

now

Delayed Sweep

expresse<l:

of the dis-

expancled to full

the

ratio of the

(Tirne/Div)

switch

of the swcep is

for

shutofi of

Delayecl-Arnred

start at the

operation,

en([ of the

a triggering

This triggering prrlse

of the

inclicates

the

setting

is

it

pos-

waveform

Delayed

by the

the

will

to as

accurate

off when

of the

rate. The

is

set

the

pulse is

be

2-to

operoting

instructions

section

-

2

nlay be

either the input

ot an externally-derived

irrg Source,

in the sanre lnanner

antt DELAYED

Arrrre<t mode

not start

DELAY VERNIER

setting, but instead

triggering following

ruro<le

.{rured urode

2-4b.

The arrtted clelayed

to be conrirruously variable.

lrc

used whenever

cunrulatiye

sweep

g.

Auto

sweep ranges'when

sweep free

cies between

cycles

nal

immediately

mode.

lng

srgnal ls

running

,The

when

will

always be

to

the

operation,

Coupling,

Slope, and Level nray be selected

as for

triggere<l operation.

of operation,

lxecisely

at rhe delay rirne indicated by the

and NDT

is initiated by

the indicated delay interval. 1'his

frorl now on will be

of sweep operation. See Figrrres

tirne

jittel

and the delaye(l magnified

Automotic

triggering

runs

is

applied-

thus

-providing

mode

autornatic

doing

-oscilloscope.

set the

the signal to be displayed has ac-

between the

NDT

Swrep

provides

there

undl

a trigger

l0

cycles and

The application

switches

stable sync.

removed,

after

the

a delay

NDT

equipment

visible

with

To

obtain automatic

Sweep Mode

AUTO position.

h.

HF lecurront

Stable synchronization

nals

can.be

is

operadng in

tion

-is-

switch

improves
ing

repetition

stable

to

beyond

i.

Single-Swcop

Sirrgle-sweep

nloves

sweep to view a varying

overlappd

displays

r'hen

ever,

input

shape,

best accomplished

selected by

in the

the count

synchronization

50

but one

arrd rrnintelligible

being

it is rlesirecl

signal which

or tinle, the instruurent rnay

Sweep

the

recurrent

setting

HF

RECUR

down

rates

of

5

of

Mc.

Operotion

oyleration irrlers

sroke rrntil reset. Using

wavelorrrr u'ould

suprinrposed on

to view a

continually varies in

wavefon to the oscilloscope

niggering

the conventional STROBE

signal. The

In

the

trigger-

Dclayecl-

the Delayed Sweep does

TINIE/DIV control

next

the

referrecl to as the Delayed-

<lisplay does

The Arnred nrode

srritable

2-4a ancl

not appear

shoul<l

start o[ the nornral

section.

visible

a

is no

approximately

base

line

signal input.

signal with

on all

The

frequen-

l0 6ega-

of the trigger

the sweep

sweep

of about

sweep

testing

or without

very

of

when

mode.

rhe Sweep

position.

and lock.in

Mc

or

signals of I

to

the tiiggered

When the

reverts ro

trigger-

the free-

I second"

mode is

since a reference

high

greater.

very

a signal

NDT

toggle

Recurrent

switch

frequency

the NDT

Mode

Use of this

of signals hav-

Ii provides

cm deflection

applied

uselul

trace

sweep

sweep

operi-

[%gle

switih

that the tirrre base

a reptitive

result in an

<lisplay caused by

one another. How-

single <lisplay of an

be

many

amplitude,

set up for

sig-

sig-

O

single-sweep presentation.

one

stroke of the

ation

elinlinates the

tiple traces

or recorded

Single-sweep

Delayecl

the Delaye(l SweeP is

Sweep

sweep at

and enables the display to be vie\^'ed and/

clearly.

operation

in

the Delayed

the NDT Delayiug Sweep,

to trigger the NDT Delaying

1:lishe<l

Sweep LEVEL control to

by

connector. The Delayecl Sweep will

uDtil

sweep will occur

are locked oua until

words,

tinre

travel, the beam will

The

the
trigger signal arrives.

2-8.

thc sweel) nray be

nrantrally by rotating the NDT Delaying

a signal

applietl

triBger signal

a

after

a single trace will sweel) across the

the sweeP is triggere<l and at the

'l'o

rearrrr the sweep, procee<l as instructed

will

swecp

screen arrd

SWEEP

then

is

arrne<l ready to

EXPANDEN

When the POSITION control

exl.rarrderl

o[ l0 about thc screen center. Thus,

exparrsiorr
segrrcnt

TION control

o[ the

tlte POSITION coutrol.

of a desire<l segrnent of the

inierest

of

exparr<led

to rhe screen center with the POSI-

and pull out this control. Any portion

<lisplay nray

Thus, by corlrnandilg but

a tirne,

overlapping

is

single sweep

cause<l

by the

obtained by using the

Arrred rlo<te. Since

arnred

to

the

by a trigger derived froru

the

arnlirrg procctlure

Sweel:. This is accom-

both

extrernes

the ND-I-

EXT TRIG

electrically

or

renrain anrretl

arrives

which further incorning

to fire

the sweeP. One

circuit is rearnre<l. In

screen each

triggers

end

rest ofi
retrace to the left hand si<[e

screen.

fire rvhen

the rrext

knob is pulled

horizontally

It

observecl by adjusting

bv a factor

to achieve

trace, set

an

oper-

nrul-

input

other

of its

above.

out,

Xl0

that

lVheu the irrstrurrrent is set up tbr Xl0 expansion

of

the sweep,

the

sweep rate

indicated by the

setting

of the TINIE/DIV control rrrust be divided by l0 to

obtain

one division. For

is

rnilliseconds,

slon.

2.9.

the Main Frarrre
panel

the actual tinre required

exanrple,

set to l0 nrSEC, the actual tirue

<livkterl by 10, or I millisecond per divi-

SWEEP CATIBRATION ADJUSTTAENT

Whenever

thc

-I'irrre

Base Plug-in is removed

and inserted in another, rhe

screwdriver

SWP CAL control lrrust be

This procetlure is necessary

ence in

'I'irne

Y

be

plate voltages

deflection sensitivity

proprly

tweeD the plug-in

as lbllows:

dellection plate

Base

unit is switche<l

cavity

of the sarne Main Frame,

necessary

since the difierence in average deflection

between modules

noruralize

the gain between channels

unit aml the Main Frarrre, proceed

sensitivities. In addition, if

of the carhode-ray tube. To

for

the sl)ot to nove

it the TIME/DIV control

per

division is l0

from

front-

reset.

to conrpensate for

from the X cavity

readjustment will

affects the

difier-

the

to the

over-all

or be-

is

oI

2-tt

section

l.

Set up

CAL

signal. Allow

Figure

trol for

(60-cycle

for 5 cycles

use 0.5

for

2-2.)

2. Set TINIE/DIV

3. Adjust SWP

NOTE:

msec/div sweep and

2 cycles of the calibrator display.

2

-operoting

the itrstrurnent

a warmup

C.{L front-parrel

precisely 6 cvcles

line)

iu l0 divisions.

For

5O-cycle line, adjust SWP

of the calibrator

2-r0. x-Y otsPt AYs

KEEP INTENSITY

Screerr <larrrage
bearn resting

When <lesiring

another

signal to INPUT A connecror

the

the

to shorv

rneasurernents,

sinrilar

Set

(not the internal

X signal to X AMP

Delayirrg Sweep module.

sweep

signal relationship.

the DISPL.{Y LOGIC

carr rcsrrlt

at orre point

to view

signal generator plots, Lissajous phase

curve trace

DA Trigger SOURCE

SLOPE

X.4,\IP

display

2.I I.
is

+ GATE.

into

shor.rld

thau l5
other

vierv the

on the

pulse

the leading

no signal

rneasured

counter.

neasure

oscilloscope in
the tiure duration

DIV

operator

.

\-

the

ar-e thrrs

switch

ATTEN con[ols

the

on

GAIE

A positive

available

The gate amplitude

irupedance

an

be gteater

pf. This

devices in

output of

oscilloscope.

Use

of

the

generators

edge of the pulse

clelay is incorporared

1'he

perio<l of the

extrerrrely

Since the pcl io(l

of total

anrl

the V,\RI.\BLE

to rlisplav

entire

srveep. Tirling

readily obtailable.

ro

+.

screen.

OUIPUT

gate coincident

on a front-panel

of 500

than

positive

order to

such <levices

gate

ourput in conjuncrion

will perrnit

sweep tinre, it is

conjrrncrion

of input signals.

the rvavetbrn

for nonnal display

switch

tirne

to l0

l5 minr.rtes.

of

mSEC.

screwdriver con-

o[ the calibrator

display. For 400-cycle line,

adjust

CAUIION

SWP

LOW

[rotl too irrterrse

on the screen.

one voltage plotted

tinre base)

on the Y Plug-in and

(green) BNC connector

X-Y displays nray be

itrforruation and

swirch to X ALIP,

switch

Adjust the

Posirivc

accurately

to EXT, and the

VOLTS/DIV

to

obtain an aPpropriate

r.ith

the sweep

BNC

counectoi labeled

is

volts

2.5

ohtrs and load irnpedance

l00K

ohrns shunred by

pulse nray be

achieve

usecl to trigger

sufficient delav to

conrpletely

with triggered

rhe

instrutnenr to display

waveforrn

in

the Y

gate

n)ay of course,

with an

of the

gate outpnt is

possible

u'ith

a corrnter to

Use

of rhe TIttE/

controls

accuLacies

rtill perruit

to lrc nreasurecl

of I

instructions

of the

(See

display

CAL conrol

CAL control

a

against

used

other

the

DA

and

olrrpr,rt

less

be

a direct

cligitize

the

over

in lOi

Y

on

zontal

Step I by rhe I'IME/DIV

cau

urrit

CAL). To

repetition

ceed as follows:

apply the

nourinal

displlyecl

even tholrgh

Arnplifier.

electronic

to use this

l)arr

2.I2.

SAWIOOIH

A

front-panel

positive-going
tude.

The

saw

volts

oI ground

sweeP.

The

sawtooth voltage nlay be

tlelayed

as a tirne base

sawtooth

ance

trrore

ator

2.I3.

scope

tirrre

brated

CAL). Use

nreasure

of interest

val, proceecl

the clisplay

activities,

output

to

ground

than

15 pf. Voltage

probe is

TI'IIE

o.

How to lvloke

UsinE the

,{ny

horizontal

can be

when

the tinre-base

sweep

of

rhe

on the

l.

Using

the calibrated

(listance

whose time

MEASUREMENIS

as follorvs:

2. llultiply

the

tirne

interval.

b. How to find

Uring the

The

repetition rate

be expressed

OUTPUT

connector

saw

ol approxirrrately

outpur

and is

is referenced

time coincident

controlling

for associatecl

should not be loaded

less

of

than l00K

recorutrendecl.

Elopred firne

CRT

Scqle

distance

used

to represent a precise

(TINIE/DMernier

this fearure

elapsetl tinre

clisplay.

in divisions between

interval

the horizorrtal dirnension

See Figrrre

Repetition

CIT Scqle

or frequency tbr

as the nultrber

of tinre (TINIE/DMernier

use the

rate

ELAPSED

oscilloscope for rueasuring

or frequency

TIME EOUALS:

T

I

x

E

s

Figwe

2-5.

Elopsed fime

labeled

SAW provides

25

within

with

used

an X-Y plotter,

analog

take-oft

on the

circuits are

equiprlent.

oh[rs shunted

through

Meosuremenl:

screen

set up for cali-

control

1>enrrits

benveen

To rrreasrrre

scale, nreasure

yott to

the clesired point

the rinre inter-

that portion

you

wish

conrrol

setting

2-5,

Rote

of cycles or pulses per

Frequency

of

periodic signals

control set to

of perioclic

,Ueossrement

volrs

arnpli-

minui

the NDT

for initiating

or actint

The

by an

irnped-

by no

an attenu-

the

of

oscillo-

interval

set to

accrrrately

the hori-

to find.

obtained in

to

obtain

the

signals,

pro-

a

3

of

of

2-12

operoting

instructions-section

2

l. Using the calibrated

clistance

display under observation.

2.

Step I by the TINIE/DIV

3. Take the reciprocal

Step

quotient is the rlesirerl

cycles per

2.I4. PHASE.SHIFT

To rueasure the

l.aves, ploceed as follows:

in divisions

Multiply

2 (that

the

is,

second. See Figure

Cycles/secon([

occupied by one cycle

horizontal

divitle it into

[ret;uency or reperirion rate in

TTEASUIEMENTS

phase

measure the horizontal

scale,

dirrrension obtained

control setting.

the product

of

one). The

2-6.

=

Tinre (seconrls)

difierence between two sine

obtained

resulting

l. Set up the Delaying Sweep Tirne Base for ex-

telrrally triggered norrnal

2. .\pply one o[ the sine llaves to Channel A Input

arr<l

the other to Channel B Input

.{nrplifier.

3. S€t NTODE switch to ALT.

4. Adjust the TINIE/DIV

cycles oI the

5. Position the display

slopcs
harrrl

sirle o[ the scale.

lleasure

6.

cycle o[ the wavefonn. Label

Nleasure

7.

display. Label this distance B.

8. Divide the distance neasured

distance rneasured in

by

3ti0o.

between

(lisplay

crosses

The resulting

the two sine waves.

horizontal

the

the horizontal distance

horizontal

the

sweep operatiou.

of

switch lor a couple of

on the screen.

so that

one

center line at rhe left

this distance A.

shift of the Channel B

in step 6 by

step

product is the phase

multiply

7 and

See Figure

the Type

of the positive

occupied

the quotient

difference

2-7.

of the

76-02.4

by

one

the

in

in

11

Figurc

2.I5. PUTSE WIDTH

CRT

Assume you have

Figure

to

the pulse appearing

this measurement, proceed as follows:

l. Make

fully clockwise

Set the

2.

GERED STROBE.

Pull

3.

it and rotate it

until the desired pulse

4.

Set the DISPLAY LOGIC

GERTD

in

divisions trom the

pulse

to the

ply

this distance by the DA TIME/DIV conftol

ting (Figure

2-7. Phore-5hift /l{eosuremenrr

IAEASUREMENTS

SCALE

Nonnal

a

and you wish to ureasure the width

2-8

on the pedestal

sure the TINIE/DIV Vernier control is set

to CAL. (Click

DISPLAY LOGIC switch to TRIG-

or"rt the DA TIME/DIV knob to disengage

and the DELAY VERNIER control

is intensified (Figure

DEL.\Y and nreasure

50/o

point

50/<

2.8b).

on the fall of the pulse. Multi-

sweep display similar

is

the horizontal distance

point

USING THE

pulse.

heard.)

switch to TRIG-

the rise of the

on

To

2-8a).

of

make

set-

phase.shift

REPETITIOII

Figvrc 2-5. Finding ihe

difierence

RATE OR FREOUE]ICY

EOUALS IHE RECIPROCAL OF:

T

I

E

3

:

=

a

f

CYCLES/SECOIO

IN

oF otv

Frcquency

loo.

TRIGGEREO

o.

l---------.l

i,--------\l

50%

IFHoR

=F

(DA TINIE/DIV

TRIGGEREO

b.

Pulse

width

Figvre 2-8. Pulse

STROBE DIS PLAY

rl{

oEFL

Otv

OELAY

:

setting)

(Hor Defl in

rl,lidth

---.1

PLAY

OI S

rl,leossremenls

Div)

2-13

section 2

operoting instructions

-

2.16. PUI.sE WIDTH

DEIAY

1'he follorving

(parallax interpoladon

be used

l. Nlake

fully clockn'ise

Set DISPLAY

2.

STROBE

the signal.

Pull

3.

to the right

dot.

4. To

VERNIER control

palt

of the leading

Record

2-9a).

5. Turn the

the bright dot

of the same pulse

reading,

6. Subtract the

step 5. Then

VENNIEI

technique ayoids hurnan error

rvith more

sr.rre the TINIE/DIV

than routine accuracy if needed:

to CAL

LOGIC switch to TRIGGERED

and acljust

out the

the

DA TINIE/DIV knob and turn it

until the intensined

measure pulse

until the bright

edge of

the dial

reading.

DELAY

to the

50/c

(Figure

reading

nultiply

the NDT TINIE/DIV

pulse width.

2.I7. PUTSE

Pulse

variations

aurple, assuure

the

screen and it is desired

the train for

JITTER MEASUREXIENTS

jitter

rnay be defrned as

in pulse

jitter;

spacing in a pulse train. For

normal

a

to

check,

IIEASUREiIENTS

CONTROT

graticule lines) and should

of

Vernier control

(click is heard).

controls for several cycles

area

USING

is

a small bright

'HE

is

width, turn the DELAY

is

spot

the desired pulse

VERNIER control

point

on the trailing

2-9b). Record the

of step

the difierence by the setting of

switch. The product is

small

pulse train is displayed

to check a small pulse in

proceed

ar the

+ frour

incremental

as follows:

50%

(Figure

move

to

edge

dial

that of

the

set

ex-

on

of

PULSE JITTER,

Figurc 2-lO. Pulte

l. Set up the instrument for external

Set the

2.

GERED STROBE.

3. Pull out the DA

to

the right until

display

checked.

4. Adjust

strobed sector over the pulse.

Set the

5.

DISPLAY LOGIC

is about the same width as the pulse to be

the DELAY VERNIER

DISPLAY LOGIC

(HOR

0EFL

rX

0rV

) I

OA TrME/o|V

Jiltq /Ueqrureman,

triggering.

switch to TRIG-

TIME/DIV knob and turn it

intensified

the

zone (strobe) of the

dial to

switch to DELAYED

move

TRIGGER and adjust the DELAY VERNIER

trol to position

6. The leading

jitter

show

rneasured in

tance in

the DA TIIVIE/DIV

divisions of the

the suobed

edge of the strobed pulse

if present.

time by rnultiplying

knob. See Figure

pulse

to

The amount

the horizontal dis-

jitter

area by

screen center.

will then

jitter

of

2-10.

can be

the serting

)

I

the

con-

of

2-14

BRIGHT

q

=

Ai

=

Pelse

lst DEIAY VERNIER Reodins

:7.65-3.15

b-q

width

Figure 2-9. Puke Widrh /UeoturemeDrr

:
:

lAr)

11.201

=

(NDT

(2

1.2O

TIME/D|v

mSECI

:

8.4 mSEC

sefting)

:

b

2nd

Given:

Using Deloy Vemier

HT

DEIAY

Sweep Rote

VERNIER Reoding

Diol

DOT

=

2 mSEC

sEcTloN

3

3-1. TNTXODUCTTON

(Figurer

To

sirnplify circuit description, functional block

and waveform

LOGIC switch settings

Figure
Figure
Figure
Figure
Figure

Figure ii-5. Siurplified

Figure
Figure
Figure
Figure
Figure
Figure

tigure

The tirning

points

Iationship.

waveform

nrentioned

interrelation

ation. It is

the rear

circuit

3-2.

in the

The circuit

description.

TRIGGER

(Figures

o, Normol

Since the input o[ the Norrral

ing

circuit (NDT)

(DA) tlig^gcl circuit,

3-l ro 3- 12)

timing diagrarns at various DISPLAY

are provided as follows:

3-la. NDT Trigger

Block

Diagram

3-lb. DA Trigger

Diagrarn

3-2. Nornral Sweep Nlode,

Block Diagrarn

3-3. Tirning Diagrarn

Display

3-4. Triggered

Block Diagram

-

Triggered

3-6. Delaye<l Triggered

Block Diagram

3-7. Simplified Timing

Delayed-Triggered

3-8. Arnred

Sirnplified

3-9.

Strobe Nlode, Functional

Block

Diagrarn

layed-Armed

3-10. Delayed-Armed

Block Diagram

3-ll. Simplifrecl

tayed-Almed

3-12. Horizontal

Functional

diagraurs

circuit and in

In

addition, a

is provided.

description

illustrations.

of circuits

also recomnrendecl

of the manual

CIRCUIT DEsCRIPTION

3-lo ond

ond Deloying Triggering

is sinrilar

show waveforms

Eurphasis

rather rhan

be

3-l b)

only the NDT

CIRCUIT

Circuit Functional

Circuit, Functional Block

Functional

{or Nonnal Sweep

Strobe Nlode, Functional

Tirrring

Timing Diagram

Tirning

Dellection

capsule description

wilt be

reterred

to rhat of Delayed Armed

Diagratr for

Strobe Display

Nlode, Functional

Diagram for

Display

Strobe Display

Nfode,

Display

Block Diagram

proper

Functional

Diagram for

Amplifier,

relative tilne re-

keyed to

is pla(ed

on derail

that the

and Delaying

schematici

to in following

circuit will

for De-

at critical

of each

the afore-

on the

o[ oper-

trigger-

DESCRIPTION

De-

at

the

be

discussed in detail.

rlescription

The input to the

rtay

Trigger

(l)

tained from

of the X Inpur circuit.

be selected fronr

SOURCE switch as follows:

In EXT or EXT/10 position, the signal is

an external source through the EXT

TRIG front-panel

(2) in INT position,

Y

Plug-in unit; and

in

(3)

one sirlc o[ the 6.5 VAC heater circuit.

,4, choice of AC,

by

the Irigger

tion, the trigger

consisting

low-frequency

cutofi

high-pass filter

DC position,

the triggering

arrrplifier.

series with
protect

input

Preselves

LINE position,

oI C8203, C8205,

cutoft

is raised to l0

now has R8204

the high-pass frlters

signat is

The RC network,

the g-rid

the input circuit from damage

voltage. Shunt capacitor

the high-lrequency

The negative pulse

arnplifier

signal

the

going portion

this,

desired polarity

For positive-going

the

nection is

the

adjustable

R8222.

riggering

switch.

Thc

trigger

transformer

applied to

oI the delaying

The TRIG

diode

BAL

V8202

adjustrnent

u,hen

occurs

at the input. However, it

during

sweep

of the excitation

the Trigger

grid

opposite grid is

of

made

V8201,

by means

This conuol

point fbr

output from

shaper

trigger

adjustrnenr R8234,

through

Q8202

18201.

series coupling

sweep gate multivibrator.

SENS

at its optimum

of the Trig

the Trigger

Re[er to paragraph

uigger

connector;

ACF, or DC coupling

COUPLING switch. In

signal is applied

of 80 cycles. The low-frequency

Kc

of

when

only

either a

SLOPE switch is used

of the riggering

signals, connection

and for negative-going

to the grid

connected to

of the

is used to

all settings

V8201

which drives

The resulting

adjustnrent

trtnnel

diode

SLOPE

3-8 for a

amplifier

of three

one

the signal is derived from

V8201 ancl V8202,

sources

via

the

ob-

the

the signal is tapped from

is provided

the AC posi-

to a high-pass frlter

and R8207, providing a

in

the ACF position

shunting R8207. In the

are disconnected

applied directly to the rigger

R8206

V8201

signal component.

at rhe outprrt

chere is a positive-going

positive-going

signal. To accomplish

and C8202, in

or V8202,

due to

C8202

across R8206

the

o{

is desirable to

or negative-

the

and

and

serves to

excessive

rigger

start

to select the

signal.

of V8202. In each

a dc bias

Trig LEVEL

select rhe level

of the

Trigger SLOPE

V8202

or

diode

sensitivity.

sets the level

CR820l,

LEVEL

srvitch

is apptied

the trigger

negative trigger

CR8203 to

R8229,

control is

is

set from

is made

signals, con-

coupling

rhe

sets

The

of V8201

so that no

required

case,

source,

control

of the

to a

rhe base

tunnel

TRIG

and

re-

pius

to

ro

is

3-t

section

3

-circuit

Isor"c.l F.orr-l

description

rnrccra

I

laveur,:a

I I rn,cm I

I ls,^era

I

Figvn

3-lo. NDt friggot Citcuit, Funclional

Fo,r".

",c'l

F.o"rl

Elock Diogtam

3-2

Figurc 3- l b.

DA

fdggcr

8 X tnptt

., Functionol Block

Citcui

Diogrom